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base: support for multi-staged child startup

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This patch enhances the 'Child' and 'Child_policy' with the ability to
separate the different steps of bootstrapping children. If the
'Child_policy::initiate_env_sessions()' returns false, the child's
environment sessions remain unrouted at construction time. This way,
child objects for many children can be initialized to a state that
allows the children to represent services for other children. Therefore,
session routing can be applied before any child executes.

At this stage, the environment RAM sessions of all children can be
created. Note that this step still has the limitation that RAM sessions
are generally expected to be provided by either the parent or a local
service.

Once all children are equipped with RAM, they can in principle receive
session-quota donations. Hence, all other environment sessions can now
be arbitrarily routed and initiated.

Once the environment of a child is complete, the child's process and
initial thread is created.
This commit is contained in:
Norman Feske
2017-02-19 21:40:52 +01:00
committed by Christian Helmuth
parent 9cba459958
commit 7d9f68493a
4 changed files with 85 additions and 25 deletions
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38
repos/base/src/lib/base/child.cc
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@ -712,6 +712,31 @@ void Child::_discard_env_session(Id_space<Parent::Client>::Id id)
}
void Child::initiate_env_ram_session() { _ram.initiate(); }
void Child::initiate_env_sessions()
{
_pd .initiate();
_cpu .initiate();
_log .initiate();
_binary.initiate();
/*
* Issue environment-session request for obtaining the linker binary. We
* accept this request to fail. In this case, the child creation may still
* succeed if the binary is statically linked.
*/
try {
_linker.construct(*this, Parent::Env::linker(), _policy.linker_name());
_linker->initiate();
}
catch (Parent::Service_denied) { }
_try_construct_env_dependent_members();
}
Child::Child(Region_map &local_rm,
Rpc_entrypoint &entrypoint,
Child_policy &policy)
@ -719,15 +744,10 @@ Child::Child(Region_map &local_rm,
_policy(policy), _local_rm(local_rm), _entrypoint(entrypoint),
_parent_cap(_entrypoint.manage(this))
{
/*
* Issue environment-session request for obtaining the linker binary. We
* accept this request to fail. In this case, the child creation may still
* succeed if the binary is statically linked.
*/
try { _linker.construct(*this, Parent::Env::linker(), _policy.linker_name()); }
catch (Parent::Service_denied) { }
_try_construct_env_dependent_members();
if (_policy.initiate_env_sessions()) {
initiate_env_ram_session();
initiate_env_sessions();
}
}